1 /* 2 * (C) Copyright 2012 3 * Joe Hershberger, National Instruments, joe.hershberger@ni.com 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #ifndef __ENV_CALLBACK_H__ 25 #define __ENV_CALLBACK_H__ 26 27 #include <linker_lists.h> 28 #include <search.h> 29 30 #define ENV_CALLBACK_VAR ".callbacks" 31 32 /* Board configs can define additional static callback bindings */ 33 #ifndef CONFIG_ENV_CALLBACK_LIST_STATIC 34 #define CONFIG_ENV_CALLBACK_LIST_STATIC 35 #endif 36 37 /* 38 * This list of callback bindings is static, but may be overridden by defining 39 * a new association in the ".callbacks" environment variable. 40 */ 41 #define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \ 42 "baudrate:baudrate," \ 43 "bootfile:bootfile," \ 44 "loadaddr:loadaddr," \ 45 CONFIG_ENV_CALLBACK_LIST_STATIC 46 47 struct env_clbk_tbl { 48 const char *name; /* Callback name */ 49 int (*callback)(const char *name, const char *value, enum env_op op, 50 int flags); 51 }; 52 53 struct env_clbk_tbl *find_env_callback(const char *); 54 void env_callback_init(ENTRY *var_entry); 55 56 /* 57 * Define a callback that can be associated with variables. 58 * when associated through the ".callbacks" environment variable, the callback 59 * will be executed any time the variable is inserted, overwritten, or deleted. 60 */ 61 #define U_BOOT_ENV_CALLBACK(name, callback) \ 62 ll_entry_declare(struct env_clbk_tbl, name, env_clbk, env_clbk) = \ 63 {#name, callback} 64 65 #endif /* __ENV_CALLBACK_H__ */ 66